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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18322f75c54de47b0fea8b7860fe9a1bd96f7f611ba6e9f36a0c0f05bfc8477d' 
  AND token = 'HuPOW8O3Ncbe/lcjO8fmpRt+Sd1Suwk5zM92r4cXsdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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