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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3827cf3bcca6ae7d3d8509149aa9d15ce8a47667e1eb99da1e65ea34a18cdf' 
  AND token = 'o5+QcAvgHLoan4xkJR/2Gk9ZG2otv34H1hIe+qyPfAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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