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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7770e56dced47f541584120c92c4e27d47eb19cb8ecb50a23cb34be8b1dae04c' 
  AND token = 'dW29J8UCloK/PIFcqwAmYSQP2ibraCzr7Va4hE6dk6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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