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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71877404f7477cd89b43f1e7aa65e1a7175f7ec1ee091d02d4777dfc44e883a9' 
  AND token = 'yycQO2VtBDz1e4HN0BBkvg6DXf0qq9YpwOIvbN9i+lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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