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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79131b0460ccb76a8e68bdcccb9eacd38c1fb524a02a5c0610b26436777f4c56' 
  AND token = 'lhN1fQV4SBttu9LQYAzxAsuawanEj9K3H7tRyrLSG8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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