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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce6e11da6c7de1b218f2ec8891b8106d645c1907224c53f140f42bc408e09b3' 
  AND token = 'ZGzObWYdNFkgNu8a+6Uc0vDPl49NsdKswKP+UyVTcck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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