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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bd8f5d23cab75da87990ffb6538e2fa5fb7d0cbb39c8be970e8c8630db9abd' 
  AND token = 'f9LTNOq0PcAoQt7PY5R41htDVLsm11kIM/zKi7/JOxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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