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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30c8414e23a930c933796da751465728de15d1d31b14793ea99817f4d665c98' 
  AND token = 'KwcMsqwxDWfwcWz8rYTS4vx4Ul5JT9IU8oRkh9JIMFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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