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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d747445b468a55da114ec1d4abeb2967f80e32cd42b4f81a58a03b90b1e51e' 
  AND token = 'ppS3/xqFd9Im5pjhoTqDgkVO2L7lwn4uQFtA5Xb8QJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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