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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdb1f16151f8d0272a87524ca8442937440d1ae82bf3bf45f6a869cc6f71eb2' 
  AND token = 'IwvZxU0cb1ggPo4MWOU7mZpjo9z6uo1v+2/8Wv8G3HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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