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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3637eea1df89949d5a84c42aef56d5aaefd81f3b3dabbe1d1e2a0537e26a70af' 
  AND token = 'UJPX/qpTbn6UZFIjV1Fk/sC7iyhT3MW1iNoA9JgIirA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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