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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbce8bffae0350b04e8b7d946c968a4024d1ee2c391db43e35fb0d08344926bc' 
  AND token = 'JuBYxndp1f4idMJcDj+m3CPfmxoiezTcuPA//l+YUPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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