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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3265672f671582055776767ba1fc45b32966ed278f9e1d34ed7f6130a12682b3' 
  AND token = 'Fc89QdAJfK2UQMoG68q2oQmc9UfQbbFf8sgCRcurCwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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