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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc2bbb8bccac8994dc43cf15139f5cfd2fd5e4d616d941d071cedf783a9f75c' 
  AND token = 'T56Q97RyfeNtX3348KTFVzDMWEQAEvwUHhC8yFp4Zog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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