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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a5d5b6c69fca8c78ca6932ae8f0e8a06f611ad755eaec0d58d0a888af48c68' 
  AND token = 'Dac4O/FWzxdQjktD9Xh3XnbQnoYLKc1XXboP8hFwStM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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