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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7846aee14b746925bd1e6fad5469461f7a6b1078c9960ff3ad34a3637353ced' 
  AND token = '2dMPYbV1S+7clq4ZdhuKSJW9s2raU4p7jPwphYTymIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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