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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c473f79d958d0a7d3adb9586cd39c3b5c55c5135d3b0018ed84790634f0367ca' 
  AND token = 'wRiuhbJcEOXupXluGkp6xeT6ctn7GVM1SL/uuiBsOYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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