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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98a806801902ea4b138e01a371142eb76038a8c7e9c96888e34cebdacd2cc49' 
  AND token = 'XOwJbHGVX+ZokCkiwENoB9jKGgoMm95+E4at9ikLhvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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