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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1524e4cede84bf68dd4515199c85b5e4179698597e53e337a66ecf00c12742f4' 
  AND token = 'jOgdGnCHsM5KUUCnnxW0AG6kRIjDha9BmQRZuD5rCrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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