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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261cd814c4d324ce9141cb60bf39baed304b5991c98337ce91f36b2937f7026b' 
  AND token = '5oHrwsICECOf+LROS3IXBXDnC5a6QDByCt/XfUgKWkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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