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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91dba7e8d0b5dad239f24c4f5ff83b4cb6eed91ab1cf185b7e97e3ffb2d0387' 
  AND token = '9+MWmY4VSHV8y1uAROVoIIJ7PXrBhZbIiKXjbVNKXLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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