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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce8c7bb016fba8b4fadb247f2b7c07ac772fb26f8fdaeaa68cb6bf47bececf5' 
  AND token = 'F44wkQMGtbLg3iemRGfU8rFSWvnOn8VMM9O9c67Ahxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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