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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a6a7672b5b31be7e4e277bb64ef748bd8eacbbd28af8c98a51587839f5c2aa' 
  AND token = '+IU8E6uuHNduMqaAk4EfJtJHJVpS+A+eYw7ybfiDqoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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