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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0ff60e4c133581285db02be94b093e42c710e7311c6ba337b63c18eb54cf14' 
  AND token = 'yhLBIvTyzlwZYSot8AHOqssWkUgCelQAjkWwX0a2cxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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