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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cd92b1fd164d245fb2910274a429ddb4b98e0d723a58b8ca0a5198a240aeac' 
  AND token = '6O6F1t0r+8TnIvyOxlR66Xf8hvlpO2uE+kKq98BrDwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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