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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6191b545d80b8c759aac55013fc333b7ec51c89ae859889324e124e0d8ab74' 
  AND token = 'tLNuV1AGDaWjFkSVRlRwuqAtDW+vmWOKC9Bq+LR7FYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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