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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea08cb6eb4c59b28527ad7e46aa27f4c72ba1733a745cd50229df129a4e33ec6' 
  AND token = 'lBbAO/MQSmxrz/t5AwZMy9yhCQQ+/eqxNTCmHwYVy4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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