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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb6921f3a6c165a63405dccc763187029f2f68a12d185e1671543e3afd84135' 
  AND token = 'YvGhUl7RTWlyReMyUZQrOvwwInVNU33je/xQpt9tHH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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