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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32af1ec94b7ce677b72e03d7227c0ae59c7fe7b6eee400e0198248f550f121df' 
  AND token = 'sUzGqWLXlSnI8Onktxq4H8WGvuEyy7cfxDy6Y+8q3jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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