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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe81357503c59adf3c4dade32eba96b9bcfdbc0f8f5d35be2f4d40ca0c38617' 
  AND token = 'KHr6zR3QaKuhf/oojq4mxszn2OBrgh6C/6XLPtMMNeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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