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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a82344327e6d693de7a52e093f9acc7aaa39c7e1ad90d3f7e97c7080cb06af4' 
  AND token = 'akk1548DiBnZgqmP6fnKsUYwUk2Shgq55JvTR9psAFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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