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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d04ebc2448383ede7805a2d52dc0cd99f5fbf6b01ee5ebe0cfb2df910cb4f9' 
  AND token = 'CN23mAC36P66Bmads15K+3nIJdDbDS/WmUqiiLv7LvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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