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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db70b51d9b2a58898c30e34bad6f7d2c5afbefea289b27231e9e5cc14d42aa2b' 
  AND token = 'AYS8Zsiz0r3PKTpMaIpmh4YJ5QzOckE5Dc1mgeNrrdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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