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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf8c9d0260ec0feabdd7e340337f742845b6ef4a60d0a70e9b9e0a18f6ed52a' 
  AND token = 'AQO0kdpkexMuZVxPtwBLZYiXEwSMsc0/ioSy3nIw+bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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