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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742c4a7854ecc0c8353421a62ad83367b1a7f8ee4d4527f6b85bc7674537cb77' 
  AND token = 'mo2KKXA7N4DTImQx//gSM6WfEuLHkoZtf2Xdb9YlVw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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