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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42bc31675aac331dd2a93ee11025222bd4a56c661688b04964d05c393556ae3' 
  AND token = 'GaAa26a6Qj+GSZV7W5byrz6lKZ70yxrQPmnof/tH+Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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