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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f3fe9484ba812e14d840773817960918a5a872190b2b2465bb802a99bf0ecd' 
  AND token = 'i0qMGtE6UbKUxOvFc4N5OzvfjU7SF3vxNoq3ls/Keqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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