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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45f43b9adc5d56eeb4bbd4439456c1a4ff28f806271ee827776408855714123' 
  AND token = 'kMdfGggJ1zzbkZJoy7CIKB2D3N4S7lNIxtlaPxKt1S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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