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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fec3801e8f7460f132ae017653449641af5ef778adbec7d3952d6d2dcb3abb4' 
  AND token = 'KZCVp83auKtrHt93G5TrdLgI9FCklodVrYw00/qhfFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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