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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b97d742e646a0cdaa07c774a88c25efa79ba2d4def2bdfd91539854ef386a47' 
  AND token = 'aZnhO22KKghJGB91wR3ogrgYrtLHzDy/DdEdufqO7n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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