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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6b18b3ce1b40be0890a1074292bf31f697d7c59936e54dee3e9bb4e8e18fbe' 
  AND token = 'bZxOm8yEZwQlNv7zDKb5mHQNj7A4RfEvt71Rc1Fq3eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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