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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9597d2e73e743ab2bda9041f287b1557a56c404c06d9478d50aa739d4a9d00fc' 
  AND token = '4kxiMeGPjXxztIalNRrYqG7Yzo9yqtdPD5DblphR9JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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