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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63492eff17e8263b8e06c082f8f1047bf7c189b34ed526ad0e829aa00841bac' 
  AND token = 'Q4g7l/WrUFdQmw7NQbYilDw6q6/s99I9Fx6KQ++ulhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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