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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17f12c0b8112553387fd916d228fbe81f3bfa62b2e1c863d231ce7991976903' 
  AND token = 'guxzv4kaL0QLWytib5xrCk4S3drmaXnRNAYqP850UwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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