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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fde9a6cd09117ddd3de5f8440dc6cdbba44f88300213a83f37eac5cd68a5ac7' 
  AND token = 'Oo0bVTBUCn5Xi6ochzBR15jPAuRk296sAjQdl+Nhe0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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