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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbcf9b3de8b7c33373fa52d687ff6182685092482737471618bc61174859ccc' 
  AND token = '0w/RK3BXvPuE9Nt5t3vREKndsd9SY3e0ZvffG1Rek+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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