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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4936645ff30f9437c67406c2fe0018e8cd3937ff6cc7b8e416c9dbdbe87b68' 
  AND token = '/NIq95CpjicDRckMOlVFnxBUGHLDAShi/hAEo4ffrb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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