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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbfe5c7548eb19805bd00ea9e44928550f6862e2a838ad30a20ba64468829b8' 
  AND token = 'gLz6A6A9tWf3Z4L5s/unlb4neWfW9wDQkG721FvGDsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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