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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0fcb793757a556a7f2906bea3b668b9827a000b40e79234e859328ac71782b' 
  AND token = 'TZubSV5M0DPLSQz87L7By2FOUv62sohYVJ4yjCvNCdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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