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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493dd609c77d6538be0d4baccfe4c1a0114effd407bfe3310594774441e7c8cc' 
  AND token = 'eUVkUHou1PKjhjPKOrMB8jY8Nn0I4gx0loN/j0W+J4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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