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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d730579c2fb4348e7f0be8e1cf427c75106f706abd14020d38330399b17b58f' 
  AND token = 'L+9BCQX649BYT7YVe04V/JhTEweMe4EO8WcP45C90m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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