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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2f0ac8c4e544f1da31f3293ff39bbcd5130b746ce91e990ce6faa60b73af10' 
  AND token = 'vELmDzr5HWVZLvGvGSrXCWR4zcTivATq3iODUuu2/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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