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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae2a174563e528c9a8a35e40acd2fa554e096a3e9cb4caadf859243ae1be1c8' 
  AND token = 'FbATfX5mRciiC6v4q0gw1uFsl+R4WULR+V+SM+48BSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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