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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a117cad34c14a952df61f863d27d327d188d75f0abe673a01d8b98ac7b189fa' 
  AND token = 'CPvJuaQO7n7/hdIOQa4/QSDmC6Y2MKqbKLdsTq4e2KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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