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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80e3eab5e7147ca9a011cb3958bd3881350f3edfc9e24ab21bced1717ebc731' 
  AND token = 'CpNFQtXlajBlSCSrB5NatMj8YTRCoM1eS9LmUrj82t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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