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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b31a499f622292b59e898b4d3dbcb85adb04d0a2f2d86303d84ee56efa789b' 
  AND token = 'K4xMnKTbePVfsP+NiZJw/pk6R1mdM/zzXbtfVDnOLbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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