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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c1c7fa7fbfb34caf4d78300f0908c76a94d1b0759c5d3dc2c1a9886733b7ff' 
  AND token = 'pxwxgjrrF6hEFesiwUnpINOipY+PJ4xZDnDhp9isd7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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