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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832c0e379d883f5aacd1785e545d980567d83044fa9947fa2732e0124066c1d0' 
  AND token = 'ElgTfFG5xTUdcckQS6ZmpmUqcbFepoRWWTbOvD2df8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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