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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2077e0354f5a61da91e783afee8acfd0d48a87cb2bb2362c50f7a5cb0454dddc' 
  AND token = '6pur4TLv8qH7LrUZVNnkbOQVEdwWNJgYE7AWpLwnzB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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