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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811436cfb3946b6f24ce8b806fa85d4e3fa7fef852dbefd1294ffdd46b855d80' 
  AND token = 'G2adHxRttaAHW+5OopEh6AcP7Hg+x9cP75jFSTGQ678=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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