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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5054159ab6f460c26ed7a4e8c6bd9e941473fbe8c50bc68c095c5110dcd6cfd0' 
  AND token = 'XrRbxoDqmtXz8Y6WfpziAIKHkhgOwKhv+N6r4161PN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}