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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a88143d24b107deb8ed7a6049eb630a59eb96f5598cdb6f276d5f2231da30810' 
  AND token = 'd02IYNS2E+OmrsIUQg7zL/Kt/xkJPFbNYd6iki1OPCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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