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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f79aaf1f03a36612345a7d5dd23432568ed112d8ea4be1516f2011651f1d870' 
  AND token = 'cDWI2rZshUHH6L9RVWrwQH9ZB/xsAb2uL0SjboIgzE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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