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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4098ccf084ce8e04a042bc2d3b5ba8dee1500444660fea46114ae8945670dd' 
  AND token = 'gvIoSqZ2jQfya1/bWn37LTWZiffJnyGWASy3WzVss+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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