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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b17a42315b24fa49095b68be207a12913d50ece42a5b2488df3ce4dcae4d73e' 
  AND token = 'NMJf5PK9HIZOs8Cw26Wl64kq5ncbSQW6eUyb/7oML1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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