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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0002e851d577c5be0b6ea4b2cf28791268c27beea5a2a93bfd6690d822a56d5' 
  AND token = 'tDBlLoKXRQytnR7/Xzwvvh9glt7idMt4DuAbgWn40cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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