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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2528cf8104bcc6613ac098e339e6aaea3f8c2719f7498d9b60287eaa8cb412d7' 
  AND token = 'LoHwfObTK8iHlsANlZsBqaZhegSriXqV0h/Y9p9iVgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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