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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b363b7bfbff32929ff5895795093f11c6c1fe95e8e2e8ff06cd8de2c2f617699' 
  AND token = '1I4g2pb+ONTkz0o6aIejspKVSfYERAOJS5jR5NRkIjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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