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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9fb9894c0578bc29a71f1573a975339102c1ab88e2c10552c379d716e27282' 
  AND token = 'swRnw9yPmt+0PRGMAHKl4N1b+iWJL2eWbJ5QONM2odY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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