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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedbaba722dce5f4462bd2677917004334e15e75fc3fce90e91bd011d01d21b6' 
  AND token = 'Ord9KWduxOC+omild3PCjtAmcQjERFLUZd9/3sTcdwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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