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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56aa264bb9cfa349c6b4a01ad31ee26d5d85c6d1b580ca6a0045d8151c3f6ddf' 
  AND token = '5Bz1ZATrDK/cXEn6ivfbIw75bVyA7M3/rzyDooYrYQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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