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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72888ae99f2d96737f7cf0277b0889549cf1771cc577460a85f42cfef257a1c9' 
  AND token = '7S5ga4K5J9X1J8weHGXYzKKW3akO70eZkukiQdzYz+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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