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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b3854910bc2b256156c9e8a4d70fa1d910367529eddff6534c0919486c7bca9' 
  AND token = 'jDl/6eOfpmX6KV08zb1U5NowE5uQltMKpVsMbbHlSx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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